WordNet sense 1 (evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock):

tree tobacco, Nicotiana glauca

WordNet sense 2 (glabrous or pubescent evergreen shrub or tree of the genus Salvadora; twigs are fibrous and in some parts of the world are bound together in clusters and used as a toothbrush; shoots are used as camel fodder; plant ash provides salt):

toothbrush tree, Salvadora persica